Synthesis and Properties of Rare Earth-doped Ceria as Solid Electrolyte of Fuel Cell

Doped ceria，在yttria-stabilized zirconia中具有较高的氧化物离子条件，是低温度下固体燃料细胞的一种可能的电极。本研究涵盖了粉末制备、稀释和电气、机械和热性能的罕见earth-doped certificia。稀有的earth-dose certificia powder，含有Ce0.8R0.2O1.9 （R=Yb，Y，Gd，Sm，Nd和La）成分，准备好加热氧化物副本，混合的R/Ce硝酸盐溶液添加到氧化物溶液中。这一方法提供了含有Ce和R的氧化物固体解决方案，该解决方案被计算为在600 ° C的空气中形成氧化物固体解决方案。The sizes of oxalates and oxides depended on the concentration of oxalic acid and showed a minimum at 0.4 M oxalic acid。24-63纳米形成于中等大小的骨骼粒子簇的24-63纳米的初级氧化物粒子。氧化物剂量的晶格参数线性地增加了掺杂稀有地球的离子辐射。这些R型 ... More 接地掺杂的certificia powder是由奇异压力（49 MPa）和跟随冷自稳态压力（294 MPa）形成的。样本在1600 ° C时在4小时时增加了98%的相对密度。颗粒尺寸（4.7-7.6微米）的样品在1600 ° C展示了一种趋势，以增加掺杂稀有地球元素的电离辐射。通过高放大传输电子显微镜观察罕见的地球掺杂陶瓷，即存在于谷物边界中的晶体管或非正相位，以及罕见的地球元素在大块和谷物边界中均匀地分布。您的位置：知道173>氧气扩散的激活能量对大块的作用（75-93千焦/摩尔）比谷物边界的作用（101-123千焦/摩尔）低。激活能量减少为稀有地球元素的离子辐射增加为0.099至0。105纳米。除了Ce0.8Y0.2O1.9和纯CeO 2之外，稀有的Earth-掺杂的氧化合物的协同作用是从测量的散装导电性中计算的，是与跟踪方法测量的良好协议。No significant influence of doped rare earth element on the thermal expansion coefficient of CeO2 was measured （11.4-12.2 x10）。四点灵活性试验，提供了158-178兆帕的Young's modulus， 53-81兆帕的强度和9.1个Weibull modulus，相对密度为86- 98%。Less（低）

Doped ceria, which has a higher oxygen ion conductivity in yttria-stabilized zirconia, is one of the possible electrolyte for solid oxide fuel cell at low temperatures. This research covers powder preparation, densification and electrical, mechanical and thermal properties of rare earth-doped ceria. Rare earth-doped ceria powders with a composition of Ce0.8R0.2O1.9 (R=Yb,Y,Gd,Sm,Nd and La) were prepared by heating the oxalate coprecipitate where a mixed R/Ce nitrates solution was added to an oxalic solution. This method provided the oxalate solid solutions containing Ce and R, which were calcined to form the oxide solid solutions at 600℃ in air. The sizes of oxalates and oxides depended on the concentration of oxalic acid and showed a minimum at 0.4 M oxalic acid. The primary oxide particles of 24-63 nm were formed in the skeleton particle clusters of median size of 2μm. The lattice parameters of oxide powders increased linearly with increasing ionic radius of doped rare earth. These r … More are earth-doped ceria powders were formed by uniaxial pressing (49 Mpa) and following cold isostatic pressing (294 Mpa). The samples were densified above 98% relative density by the sintering at 1600℃ for 4 h. The grain sizes (4.7-7.6μm) of samples sintered at 1600℃ showed a tendency to become larger with increasing ionic radius of doped-rare earth element. Observation of rare earth-doped ceria by high magnification transmission electron microscopy indicated that no crystalline or amorphous phase existed at grain boundaries and the dopants of rare earth elements were uniformly distributed in bulk and at grain boundaries. The electrical conductivity of rare earth-doped ceria ceramics was dominated by the migration of oxygen ions in bulk and was in the rage of 6.7- 14.0 S・mィイD1-1ィエD1 at 800℃. The activation energies for diffusion of oxygen ions was lower for the bulk (75-93 kJ/mol) than for grain boundary (101-123 kJ/mol). The activation energies decreased as the ionic radius of rare earth element dopant increased from 0.099 to 0. 105 nm. The diffusion coefficients of oxygen ions in rare earth-doped ceria except for Ce0.8Y0.2O1.9 and pure CeO2, which were calculated from the measured bulk conductivity, were in good agreement with those measured by the tracar method. No significant influence of doped rare earth element on the thermal expansion coefficient of CeO2 was measured (11.4-12.2 x10ィイD1-6ィエD1KィイD1-1ィエD1). The four-point flexural test offered 158-178 Gpa of Young's modulus, 53-81 MPa of strength and 9.1 of Weibull modulus for Ce0.8Sm0.2O1.9 with 86-98% relative density. Less